Bean, George Washington, Diary, in Library of Congress, Collection of Mormon diaries [1935-1938], reel 1, item 9, vol. 3, p. 4.
on the 13th of June I started with J M Grants Emigration Company for the far west on the track of the pioneers who left early in the spring. My brotherinlaw William Casper had went in the Mormon Battallion to California, & I drove the team which brought his wife (Sister Sarah Anne [Anna Casper]) & Child [Sarah Jane Casper], on to meet him, our Journey across the plains was a long and tedious onw. occupying nearly 4 months. we met Prest Young & the pioneers on Strawberry Creek[.] they informed us that they had found a suitable location for the Saints in the Valley of the Great Salt Lake, about 300 miles further west. we pushed on & arrived into the valley on the 4th of October